Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Protective role of paeoniflorin from hydrogen peroxide-mediated oxidative damage in C6 glial cells

  • Lee, Ah Young (Department of Food Science, Gyeongnam National University of Science and Technology) ;
  • Nam, Mi Na (Department of Food Science and Nutrition & Kimchi Research Institute, Pusan National University) ;
  • Kim, Hyun Young (Department of Food Science, Gyeongnam National University of Science and Technology) ;
  • Cho, Eun Ju (Department of Food Science and Nutrition & Kimchi Research Institute, Pusan National University)
  • Received : 2020.02.11
  • Accepted : 2020.03.24
  • Published : 2020.06.30
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Abstract

Oxidative stress is one of the pathogenic mechanisms of various neurodegenerative diseases, such as Alzheimer's disease. Neuroglia, the most abundant cells in the brain, is thought to play an important role in the antioxidant defense system and neuronal metabolic support against neurotoxicity and oxidative stress. We investigated the protective effect of paeoniflorin (PF) against oxidative stress in C6 glial cells. Exposure of C6 glial cells to hydrogen peroxide (H2O2, 500 μM) significantly decreased cell viability and increased amounts of lactate dehydrogenase (LDH) release, indicating H2O2-induced cellular damage. However, treatment with PF significantly attenuated H2O2-induced cell death as shown by increased cell survival and decreased LDH release. The H2O2-stimulated reactive oxygen species production was also suppressed, and it may be associated with improvement of superoxide dismutase activity by treatment with PF. In addition, an increase in ratio of Bcl-2/Bax protein expression was observed after treatment with PF. In particular, the down-stream of the apoptotic signaling pathway was inhibited in the presence of PF, mostly by reduction of cleaved-poly ADP ribose polymerase, cleaved caspase-3, and -9 protein expression. Furthermore, H2O2-induced phosphorylation of c-Jun N-terminal kinase and extracellular signal-regulated kinase 1/2 was attenuated by treatment with PF. Taken together, neuroprotective effect of PF against oxidative stress probably result from the regulation of apoptotic pathway in C6 glial cells. In conclusion, our findings suggest that PF may be a potent therapeutic agent for neurodegenerative disorders.

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References

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